Simplify testing infrastructure (#515)

* Mark runtests helper executable

* Bump required version of asgiref

We're probably making our life easier when we keep the Channels
dependencies roughly in sync. As a 1.0 release was made, I suggest to
require it.

* Simplify tox and Travis configuration

I hopefully simplified the tox configuration by following what I did in
the other four Channels projects.

I then had a good look at tox-travis and decided to remove it. It does
add a layer of indirection with, IMHO, not enough gain. To understand
what Travis is doing, one would need to consider two files (and
understand tox-travis) instead of just one file. It also introduces
another point of failure. What pushed me over was that there's a bug
with env matching (https://github.com/ryanhiebert/tox-travis/issues/55)
and tox or tox-travis seem to mask an Exception
(https://travis-ci.org/django/channels/jobs/195950971#L195) that would
be hard to debug.
The draw back is that we duplicate the Django dependency matrix, and the
commands that are executed in Travis and tox. We could add a "--with-qa"
flag to runtests.py to have it execute flake8 and isort to rectify the
latter.

I extracted test dependencies as I did for asgi_redis.

* Document supported versions

.travis.yml

@@ -1,8 +1,22 @@
 sudo: false
+
 language: python
+
 python:
   - "2.7"
   - "3.4"
   - "3.5"
-install: pip install tox-travis
-script: tox
+
+env:
+  - DJANGO="Django>=1.8,<1.9"
+  - DJANGO="Django>=1.9,<1.10"
+  - DJANGO="Django>=1.10,<1.11"
+
+install:
+  - pip install $DJANGO -e .[tests]
+  - pip freeze
+
+script:
+  - python runtests.py
+  - flake8
+  - isort --check-only --recursive channels

README.rst

@@ -33,6 +33,12 @@ You'll likely also want to ``asgi_redis`` to provide the Redis channel layer.
 See our `installation <https://channels.readthedocs.io/en/latest/installation.html>`_
 and `getting started <https://channels.readthedocs.io/en/latest/getting-started.html>`_ docs for more.
 
+Dependencies
+------------
+
+All Channels projects currently support Python 2.7, 3.4 and 3.5. `channels` supports all released
+Django versions, namely 1.8-1.10.
+
 
 Contributing
 ------------

setup.py

@@ -13,9 +13,12 @@ setup(
     include_package_data=True,
     install_requires=[
         'Django>=1.8',
-        'asgiref>=0.13',
+        'asgiref>=1.0.0',
         'daphne>=1.0.0',
     ],
+    extras_require={
+        'tests': ['coverage', 'mock', 'tox', 'flake8>=2.0,<3.0', 'isort']
+    },
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Web Environment',

tox.ini

@@ -1,33 +1,16 @@
 [tox]
-skipsdist = True
 envlist =
-    {py27}-django-{18,19,110}
-    {py34}-django-{18,19,110}
-    {py35}-django-{18,19,110}
+    {py27,34,35}-django-{18,19,110}
     {py27,py35}-flake8
     isort
 
-[tox:travis]
-2.7 = py27, isort
-
 [testenv]
-setenv =
-    PYTHONPATH = {toxinidir}:{toxinidir}
+extras = tests
 deps =
-    autobahn
-    coverage
-    daphne
-    asgiref>=0.9
-    six
-    redis==2.10.5
-    py27: mock
-    flake8: flake8>=2.0,<3.0
-    isort: isort
     django-18: Django>=1.8,<1.9
     django-19: Django>=1.9,<1.10
     django-110: Django>=1.10,<1.11
 commands =
     flake8: flake8
-    isort: isort -c -rc channels
+    isort: isort --check-only --recursive channels
     django: coverage run --parallel-mode {toxinidir}/runtests.py
-